Improved abrading- and polishing-whbel



M2111 Wit a To all whom it may concern I a {Be it known that I, E. O.MERRILL, of Charleston, in the. county of Orleans, and. State ofVermont, have inventedvan Improvementin Abrading-wwheels; and a I doherebydeclare that the following is a description. 1 ofmy'inventiomsufiicient to enable those skilledin the art to practise it;I

My'invention relates tolthe manufacture of artificial abrading-tools,such as grinding-wheels,"'hones, &c.;and I Theinvention consists in theemployment of what I term brown emery, as aprinoipal ingredient in theformation of such abrading-tools, this brow n 'emeryl consisting ofabout seventy-two parts of pure silica,

manganese-aluminum, and lime.

The material being moistened and subjected to pressure, theother-matters form a cementitiousbond totlie silica, and when made intoan artificial stone, in the form required for the abiading-tool, thesofter material gives-way, and leaves the cutting-faces of the a silicaatjall. times prominent, the softer material aiding'but slightly in' thereducing-process, but yet, doi'ng so to some extent, and rendering itnecessary to emand about twenty-eight parts of oxide of. iron, oxide ofMERRILL) or CHARLESTON, ,V-E'RM NT.

eam Patm No. 97,671, dated Da e '1, 1869.

mpnovnn ABBADING- AND roLISHING-WHEEL.

J i v l The Schedule referred to in theseL ettera Patent and makingpart-of thesame.

ploy but a small quantity of other cementitious uiatter than thatcontained in the brown-emery.

This brown emery possesses many of the peculiar and distinctivequalities of European emery,not so hard, but having clear, sharpcutting-points, and .being peculiar in its physical characteristics andcrystal structure, some particles being much harder than others, and ofa suitable form for cutting, rendering it well adapted for abrarlingpurposes.

I find the brown emery existing as a granular min! eral deposit, itsgrains being rcnderednearly uniform in size by aqueous action, and Iutilize the material by combining it with any suitable cementitiousmatter, and moulding itinto the shape required, by pressure. i

I claim, as a new article of manufacture, factitious abrading-whe'elsor' other tools, having their cutting properties due in whole or in partto the employment in their composition of the material named.

- E. G. MERRILL.

Witnesses FRANCIS GOULD, S; B. KIDDER.

